Kratom can act as a stimulant, as a psychedelic and as depressant .
Wat is a depressant?
Depressant (De*press"ant) (?), noun .
(Med.) An agent or remedy which lowers the vital powers.
Depressants are substances that slow down or depress the Central Nervous System. Depressant drugs include alcohol, barbiturates and tranquillisers. Barbiturates and benzodiazepines are the two major categories of depressant drugs used as medicines. Often these drugs are referred to as sleeping pills and tranquilizers or sometimes just as sedatives. Some well-known barbiturates are secobarbital (Seconal) and pentobarbital (Nembutal). Benzodiazepines commonly in use are Diazepam (Vallium), chlordiazepoxide (Librium) Nitrazepam (Mogodon) and Temazepam.

Downers: A New Look at Depressant Drugs

Information about drugs: depressants